High-pressure efficient pulse valve

Abstract

The utility model relates to a high-pressure efficient pulse valve which comprises a large valve cover, a small valve cover, a large diaphragm and a small diaphragm. An output pipe is arranged in the middle of the air bag, the top of the output pipe is in sealing contact with the large diaphragm, and the lower end of the output pipe extends out of the air bag; a plurality of small vent holes are formed in the circumference of the large diaphragm to serve as air inlet channels of the large valve cover, a lower air outlet channel is formed in the large valve cover, and the lower air outlet channel is in sealing contact with the small diaphragm; a gas circuit communicated with an inner cavity of the large valve cover is arranged on the small valve cover and serves as a gas inlet channel of the small valve cover; an upper gas outlet channel of the small valve cover is connected with a pilot electromagnetic valve; a pressure preparing cylinder is arranged on the large valve cover and connected with the lower air outlet channel and an air outlet of the pilot electromagnetic valve through pipelines. According to the high-pressure efficient pulse valve, the pressure preparation device is additionally arranged, and the pressure difference between the upper portion and the lower portion of the diaphragm can be reduced, so that efficient work of the pulse valve is guaranteed, and normal pulse dust removal of a pulse dust removal bag type dust collector with filtered gas being 0.4-2.5 Mpa is achieved.

Description

Technical Field

[0001] The utility model relates to a high-pressure and high-efficiency pulse valve, belonging to the technical field of pulse valves of high-pressure dust-removing bag filters. Background Art

[0002] At present, in the industry of treating flue gas, most bag filter devices for pulse dust removal powered by compressed air use low-pressure pulse valves, and the working pressure is generally 0.4 - 0.6 Mpa. This pressure range cannot meet the requirements of pulse dust-removing bag filters for filtering gases above 0.4 Mpa, and the diaphragm inside the pulse valve will be broken due to excessive pressure, causing the pulse valve to fail. Summary of the Invention

[0003] The technical problem to be solved by the utility model is to provide a high-pressure and high-efficiency pulse valve. The high-pressure and high-efficiency pulse valve is provided with a standby pressure device, which can reduce the pressure difference between the upper and lower sides of the diaphragm, thereby ensuring the high-efficiency operation of the pulse valve and realizing the normal pulse dust cleaning of the pulse dust-removing bag filter for filtering gases in the range of 0.4 - 2.5 Mpa.

[0004] To solve the above problems, the specific technical solution of the utility model is as follows: A high-pressure and high-efficiency pulse valve includes a large valve cover, a small valve cover, a large diaphragm, and a small diaphragm; the bottom of the large valve cover is connected to the flange of the air bag. An output pipe is provided in the middle of the air bag. The top of the output pipe is in sealed contact with the large diaphragm, and the lower end extends out of the air bag; a number of small ventilation holes are provided on the circumference of the large diaphragm as the air inlet channel of the large valve cover. A lower air outlet channel is provided on the large valve cover, and the lower air outlet channel is in sealed contact with the small diaphragm; an air passage communicating with the inner cavity of the large valve cover is provided on the small valve cover as the air inlet channel of the small valve cover, and the upper air outlet channel of the small valve cover is connected to a pilot solenoid valve; a standby pressure cylinder is provided on the large valve cover, and the standby pressure cylinder is connected to the lower air outlet channel and the air outlet of the pilot solenoid valve through pipelines respectively.

[0005] The pressure in the standby pressure cylinder is less than the pressure in the air bag, and the pressure difference is 1.5 - 3.0 Mpa.

[0006] An opening groove is provided at the center of the inner cavity of the large valve cover, and the lower air outlet channel is communicated with the opening groove; the upper air outlet channel of the small valve cover is located at the center and has a sealing boss; a second sealing gasket is provided on the upper surface of the center of the small diaphragm; when the small diaphragm moves upward, the second sealing gasket contacts and seals with the sealing boss; when the small diaphragm moves downward, the lower surface of the small diaphragm contacts and seals with the upper end surface of the opening groove.

[0007] A second return spring is provided in the upper air outlet channel of the small valve cover, and the lower end of the second return spring supports on the upper surface of the second sealing gasket.

[0008] The lower surface of the large diaphragm is connected to the first sealing ring, and the first sealing ring is in sealing contact with the top surface of the output pipe; a support plate is provided on the upper surface of the large diaphragm, one end of the first return spring is arranged on the support plate, and the other end is supported at the fixed part in the inner cavity of the large valve cover.

[0009] In the high-pressure and high-efficiency pulse valve of the present application, a back-pressure device is added to the original pulse valve structure, so that when the pulse valve works in a high-pressure environment, the pressure difference between the inner cavities of the large valve cover and the small valve cover is small, thereby ensuring the stable operation of the large and small diaphragms, and thus improving the high-efficiency pulse gas. Description of the Drawings

[0010] Figure 1 It is the front view of the high-pressure and high-efficiency pulse valve.

[0011] Figure 2 It is Figure 1 The A-A cross-sectional view of

[0012] Figure 3 It is Figure 2 The partial enlarged view of Detailed Embodiment

[0013] As Figures 1 to 3 shown, a high-pressure and high-efficiency pulse valve includes a large valve cover 6, a small valve cover 4, a large diaphragm 7, and a small diaphragm 5; the bottom of the large valve cover 6 is connected to the flange of the air bag 10, an output pipe 9 is provided in the middle of the air bag 10, the top of the output pipe 9 is in sealing contact with the large diaphragm 7, and the lower end extends out of the air bag 10; a number of small vent holes are provided on the circumference of the large diaphragm 7 as the air inlet channel of the large valve cover 6, and a lower air outlet channel 13 is provided on the large valve cover 6, and the lower air outlet channel 13 is in sealing contact with the small diaphragm 5; an air passage 12 communicating with the inner cavity of the large valve cover 6 is provided on the small valve cover 4 as the air inlet channel of the small valve cover 4, and the upper air outlet channel of the small valve cover 4 is connected to the pilot solenoid valve 2; a back-pressure cylinder 1 is provided on the large valve cover 6, and the back-pressure cylinder 1 is connected to the lower air outlet channel 13 and the air outlet of the pilot solenoid valve 2 through pipelines respectively. By setting a certain pressure of gas in the back-pressure cylinder 1, the pressure difference between the inner cavities of the large valve cover 6 and the small valve cover 4 is reduced, thereby improving the service life of the large diaphragm 7 and the small diaphragm 5.

[0014] The pressure in the back-pressure cylinder 1 is less than the pressure in the air bag 10, and the pressure difference is, preferably 2.0 MPa in this embodiment.

[0015] An opening groove 17 is provided at the center of the inner cavity of the large valve cover 6, and the lower air outlet channel 13 communicates with the opening groove 17; the upper air outlet channel of the small valve cover 4 is located at the center and has a sealing boss 16; a second sealing gasket 15 is provided on the upper surface of the center of the small diaphragm 5; when the small diaphragm 5 moves upward, the second sealing gasket 15 contacts and seals with the sealing boss 16, and the opening groove 17 is opened. Under the action of air pressure, the gas in the large valve cover 6 is discharged through the lower air outlet channel 13; when the small diaphragm 5 moves downward, the lower surface of the small diaphragm 5 contacts and seals with the upper end surface of the opening groove 17, then the opening groove 17 is closed. If the pilot solenoid valve 2 is in the open state at this time, the gas in the large valve cover 6 is discharged into the small valve cover 4 along the air path 12 and discharged into the standby pressure cylinder 1 through the pilot solenoid valve 2. If the pilot solenoid valve 2 is in the closed state, the pressure balance above and below the small diaphragm is gradually formed through the air path 12.

[0016] A second return spring 3 is provided in the upper air outlet channel of the small valve cover 4. The lower end of the second return spring 3 supports on the upper surface of the second sealing gasket 15, and the small diaphragm 5 plays a role in rapid reset.

[0017] The lower surface of the large diaphragm 7 is connected with a first sealing ring 11, and the first sealing ring 11 contacts and seals with the top surface of the output pipe 9. When the large diaphragm 7 moves upward, the seal is released, and the high-pressure gas in the air bag 10 enters the output pipe 9. When the large diaphragm 7 moves downward, it is sealed again, and so on, thus forming pulsed gas; a support plate 14 is provided on the upper surface of the large diaphragm 7. One end of the first return spring 8 is arranged on the support plate 14, and the other end supports at the fixed part of the inner cavity of the large valve cover 6. The first return spring 8 enables the large diaphragm 7 to reset quickly.

[0018] The working process of the high-pressure and high-efficiency pulse valve is as follows: It is installed at the rear of the cleaning air source pipeline of the dust removal device. When the pilot solenoid valve is opened under electrical control, the gas in the inner cavity of the small valve cover 4 enters the standby pressure cylinder 1 from the outlet of the pilot solenoid valve 2 through the upper air outlet channel, and the pressure in the upper cavity of the small diaphragm decreases accordingly. Due to the pressure effect, the small diaphragm moves upward; the lower air outlet channel 13 is opened, and the high-pressure gas in the large valve cover 6 is discharged into the standby pressure cylinder 1 through the lower air outlet channel in the opening groove 17. The large diaphragm moves upward due to negative pressure, and the output pipe 9 is opened. The high-pressure gas in the air bag 10 is output through the output pipe 9, forming a pulsed gas mass. When the air pressure in the inner cavities of the large valve cover 6 and the small valve cover 4 gradually reaches balance through the intake channel, the large diaphragm 7 moves downward and seals in contact with the output pipe 9, and one pulse ends. The pulse valve of the present application is more sensitive in action and can meet the normal pulse cleaning of the pulse jet bag filter for filtering gas at 0.4 - 1.5 Mpa.

Claims

1. A high-pressure and high-efficiency pulse valve, characterized in that: It includes a large valve cover (6), a small valve cover (4), a large diaphragm (7), and a small diaphragm (5); the bottom of the large valve cover (6) is connected to the flange of the air bag (10), an output pipe (9) is provided in the middle of the air bag (10), the top of the output pipe (9) is in sealed contact with the large diaphragm (7), and the lower end extends out of the air bag (10); several small ventilation holes are provided on the circumference of the large diaphragm (7) as the intake channel of the large valve cover (6), a lower air outlet channel (13) is provided on the large valve cover (6), and the lower air outlet channel (13) is in sealed contact with the small diaphragm (5); an air path (12) communicating with the inner cavity of the large valve cover (6) is provided on the small valve cover (4) as the intake channel of the small valve cover (4), and the upper air outlet channel of the small valve cover (4) is connected to the pilot solenoid valve (2); a backup pressure cylinder (1) is provided on the large valve cover (6), and the backup pressure cylinder (1) is connected to the lower air outlet channel (13) and the air outlet of the pilot solenoid valve (2) through pipelines respectively.

2. The high-pressure and high-efficiency pulse valve according to claim 1, wherein: The pressure in the backup pressure cylinder (1) is less than the pressure in the air bag (10), and the pressure difference is 1.5 - 3.0 MPa.

3. The high-pressure and high-efficiency pulse valve according to claim 1, characterized in that: An opening groove (17) is provided at the center of the inner cavity of the large valve cover (6), and the lower air outlet channel (13) communicates with the opening groove (17); the upper air outlet channel of the small valve cover (4) is located at the center and has a sealing boss (16); a second sealing washer (15) is provided on the upper surface of the center of the small diaphragm (5); when the small diaphragm (5) moves upward, the second sealing washer (15) contacts and seals with the sealing boss (16); when the small diaphragm (5) moves downward, the lower surface of the small diaphragm (5) contacts and seals with the upper end surface of the opening groove (17).

4. The high-pressure and high-efficiency pulse valve according to claim 3, characterized in that: A second return spring (3) is provided in the upper air outlet channel of the small valve cover (4), and the lower end of the second return spring (3) supports on the upper surface of the second sealing washer (15).

5. The high-pressure and high-efficiency pulse valve according to claim 1, wherein: A first sealing ring (11) is connected to the lower surface of the large diaphragm (7), and the first sealing ring (11) contacts and seals with the top surface of the output pipe (9); a support plate (14) is provided on the upper surface of the large diaphragm (7), one end of the first return spring (8) is arranged on the support plate (14), and the other end supports at the fixed part of the inner cavity of the large valve cover (6).

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